Midterm for Linux is completely free to use. It is a note-taking app with study tools to help you study better. You can use it to prepare for exams.

Features:

• Write notes with quizzes for studying (cloze deletion, image occlusion inspired from Anki).
• Sync notes with your phone and/or tablet.
• Study offline (offline accessible).
• Dark mode.
• Powerful visual editor.
• Keep track of notes to study before exams.
• Collaborate and study with your friends.
• Support nested folders.
• and many more.